The Spartans, however, lacked the internal strength to maintain their new empire.

I could never have maintained Archer's empire without you.

Athens maintained its empire through naval power.

Without me, or another like me, the human species could not have colonized the galaxy, and could not'maintain its present empire.

The Russians could maintain their empire while doing brisk business with West Germany.

At the same time, the Yuan Dynasty required considerable military expenditure to maintain its vast empire.

Scholars of economic history have worked up numbers suggesting that Britain spent more on maintaining its empire than it gained from exploiting it.

It's how the Iconians created and maintained their empire.

France needed to keep shipping lanes open in order to maintain her overseas empire.

"After maintaining their empire for a million years or so."